James Studer, 2 Barry Ronellenfitch, 2 Adam Mabbott, 2 Heather Murdoch, 2 Greg Whyte, and 3 Ian Hakes. REMTECH 2008 at Banff, Alberta
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1 PILOT TEST OF ISCO TECHNOLOGIES LEADS TO IMPROVED UNDERSTANDING OF IMMEDIATE AND MID-TERM GEOCHEMICAL RESPONSE AND CONTAMINANT DESTRUCTION WITHIN PETROLEUM HYDROCARBON PLUME 1 James Studer, 2 Barry Ronellenfitch, 2 Adam Mabbott, 2 Heather Murdoch, 2 Greg Whyte, and 3 Ian Hakes 1 ChemRem International LLC, 8100 M-4 Wyoming Blvd. NE #410, Albuquerque, NM USA; 2 Cirrus Environmental Services, Inc., Bay 10, th Avenue, Calgary, AB T2E7B2; 3 City of Medicine Hat, 580 First Street SE, Medicine Hat, AB T1A 8E6 REMTECH 2008 at Banff, Alberta
2 Presentation Goal Report on ISCO pilot test involving activated sodium persulfate and petroleum hydrocarbons (PHC) that was designed to gather critical information on: 1) Spatial distribution of components of injected fluids and chemical and biological reaction by-products within 7 and 20 days of start of chemical application; and 2) Magnitude of sediment and groundwater contaminant concentration reduction in the presence of non-aqueous phase liquid (NAPL).
3 Presentation Outline Chemical Oxidation and Injection Overview Pilot Test Background and Program Results - Immediate (7 Day) Injectate Distribution Results - Distribution of Treatment Chemicals and Reaction Byproducts within Mid-Term (20 Days) Results - PHC Reductions in GW and Soil at Day 20 Summary and Implications
4 Project History and Site Features Former retail service station in Southern Alberta Operated for 30 years - multiple fuel releases Decommissioned in site assessment followed Underlain by a sandy unconfined aquifer (6 m-bg) PHC plume including smear zone and groundwater Area of impact ~ 5000 m 2 (high impact area ~1000 m 2 ) Plume stable or growing slowly as of 2007 Requirement for remedial action and developer interest in property led to feasibility study and pilot test in 2007
5 Site Location
6 Chemical Oxidation Overview In Situ Chemical Oxidation involves the injection of a dilute oxidant (and potentially an activator) into the subsurface to transform organic contaminants into by-products of carbon dioxide, water, and other benign compounds Low temperature combustion of organic chemicals (e.g., fuels, herbicides/pesticides, PCE, TCE, high explosives) Success depends on effective chemical and hydrogeologic engineering
7 Chemical Oxidation Overview The chemical oxidation technology area currently includes four unique classes: Ozonation (O 3 and radicals) Permanganate (MnO 4 ) Catalyzed Hydrogen Peroxide (H 2 O 2 and radicals) Activated Persulfate (S 2 O 8 and radicals)
8 Chemical Oxidation Overview Klozur Persulfate S 2 O -2 8 Strong Oxidizer Persulfate anion: 15S 2 O H e - 30HSO 4-1 E 0 = 2.12 v Example of direct oxidation of benzene (C 6 H 6 ) C 6 H H 2 O 6 CO H e - Need 15 mole S 2 O 8-2 per mole of C 6 H 6 mineralized
9 Chemical Oxidation Overview In general, direct oxidation by persulfate anion is kinetically slow...activation of the anion produces a very strong and kinetically fast acting oxidizer in the Sulfate Free Radical SO e - SO 4-2 E 0 = ~ 2.6 v S 2 O SO 4 - or (SO SO 4-2 ) Initiation, propagation, and termination reactions are complex and may involve many types of radicals
10 ZOE = Zone of Effect at times of physical displacement and max dev Conceptualization of Injection & Placement R Plan View - Radius of Influence R R Profile - 2D ROI 3D ZOE ZOE pe ZOE max
11 Conceptualization of Injection & Placement ISCO! Actual Areal Distribution R ISCO-BIO Plan View - Radius of Influence R R ZOE max ZOE pe ZOE max GW Flow
12 Conceptualization of Injection & Placement Actual Areal Distribution R Plan View - Radius of Influence R Reality Bites! ZOE pe ZOE max
13 Site and Vicinity
14 Looking West
15 Test Pits, Borings and Wells (2006)
16 Geologic Profile A-A
17 Geologic Profile A-A (2006) BH-7 CO1-01
18 Potentiometric Surface (2006) Groundwater Velocity ~ 0.1 ft/day to 0.3 ft/day or 3 ft/month to 9 ft/month
19 Hydrocarbon Plume (pre-test) Iron Reduction Nitrate Reduction Sulfate Reduction O 2 Utilization High Impact Zone > 5000 mg/kg TPH Sharp Redox Zonation
20 Pilot Test Program Pilot Test Program Design Data Collection (DDC) Treatability Study Klozur Na 2 S 2 O 8 and iron-edta Klozur CR (base activated chemox-bio) H 2 O 2 DDC Scope: Field Pilot Test (Klozur CR, Klozur and Dissolvine) 1. Direct push continuous sampling 2. Collection of sediment core and samples for: 1. OVA screening, NAPL detection, TOC, TPH 2. Geologic description 3. Install pilot test array - test out field protocols 4. Baseline groundwater sampling and analysis (TOC + DOC)
21 Pilot Test Area
22 Hydrocarbon Plume (DDC 2/08) Weathered NAPL within Limits Former NAPL Footprint (>5000 mg/kg TPH)
23 DDC Plume Delineation
24 DDC Plume Delineation
25 DDC Plume Delineation
26 Pilot Test Arrays and Injection Pts BH-7 SZ Test CO1-1 SZ Test
27 Pilot Test Array Detail
28 Pilot Test Implementation Detail Injectate Summary for BH07 (Klozur+Fe-EDTA) Date Batch No. Klozur Fe-EDTA Water % w/w 2/22/ /22/ /26/ /26/ Injectate Summary for CO1-01 (Klozur CR) Date Batch No. Klozur PoxP Water % w/w 2/21/ /22/ /27/ /27/ Total injected ~160 gal of 15% and at ~60 C Na 2 S 2 O 8 C o ~ 150,000 mg/l Chemical in Kg Water in US Gallons Total injected ~175 gal of 20% ~80 gal at ~60 C when injected Na 2 S 2 O 8 C o ~ 100,000 mg/l
29 Pilot Test Implementation Detail Process Monitoring Visual Observations at monitoring wells / ground surface Electrical Conductivity Sulfate ph Temperature (heated water used) ORP (strong function of ph) Dissolved Oxygen Performance Assessment Soil and groundwater sampling and analysis for TOC/DOC and BTEX F1 F2 F3 F4 (F3 and F4 for soil only)
30 Immediate Distribution (Day 7) ZOE pe day 7 ZOE geochemical
31 Mid-term Distribution (Day 19) GW General ZOE geochemical at Day 19 indicated by yellow
32 Groundwater PHC Concentrations (Baseline to Klozur CR Day 20) Well BenzeneTolueneE-benzeneXylenes F1 F2 CO1-01 Baseline ND ND m NE Day 20 ND ND CO7-43 Baseline ND ND m NEDay 20 ND ND CO7-44 Baseline ND m NNWDay 20 ND ND CO7-47 Baseline ND ND m E Day 20 ND ND
33 Groundwater PHC Concentrations (Baseline to Klozur Iron-EDTA Day 19) Well BenzeneToluene E-benzeneXylenes F1 F2 C07-35 Baseline ND ND m NNE Day 20 ND ND ND C07-36 Baseline ND ND ND m NNE Day 20 ND ND ND C07-38 Baseline ND ND m NNEDay 20 ND ND ND ND 0.3 C07-41 Baseline ND ND m ESE Day 20 ND ND ND ND
34 Baseline Soil Sampling Locations
35 Post-Injection Soil Sampling Locations CO7-39 to BH08-57 C07-45 to BH08-55 BH06-26 to BH08-56
36 Soil PHC Concentration Changes (Day 20 after First Klozur CR Batch Injection) Comparison of CO7-45 to BH08-55 (Before and After) Analyte CO07-45, mg/kg BH08-55, mg/kg Benzene <0.005 <0.005 Toluene <0.05 <0.05 Ethyl Benzene Xylenes F1 -BTEX F F F4 12 <10 Note: Value in bold indicates the soil remediation guideline is exceeded.
37 Soil PHC Concentration Changes (Day 20 after First Klozur CR Batch Injection Comparison of BH06-26 to B H08-56 (Before and After) Analyte BH06-26, mg/kg BH08-56, mg/kg Benzene 0.11 <0.005 Toluene 0.11 <0.05 Ethyl Benzene 84 <0.01 Xylenes 315 <0.05 F1 -BTEX 3630 <10 F F F4 <10 <10 Note: Value in bold indicates the soil remediation guideline is exceeded.
38 Soil PHC Concentration Changes (Day 19 after First Klozur and Iron-EDTA Injection) Comparison of CO07-39 to BH08-57 (Before and After) Analyte CO07-39, mg/kg BH08-57, mg/kg Benzene < Toluene <0.05 <0.05 Ethyl Benzene Xylenes < F1 -BTEX F F F4 <10 16 Note: Value in bold indicates the soil remediation guideline is exceeded.
39 Summary and Implications Idealized injection ROI rarely occurs and is even more rarely observed - the ZOE pe and ZOE max (or ZOE time ) concept is more applicable Few empirical studies of short and mid-term injectate and by-product distribution (need more and better studies) ISCO and ISCO-Bio phases of action are highly dynamic in four dimensions - what is your ROI???
40 Summary and Implications Distribution and migration tracked using visual presence of injectate, heat, sulfate, EC, ph, ORP, DO, TOC/DOC as well as BTEX F1-F4 Short term ZOEpe non-uniform and variable but geochemical response more uniform-widespread Significant mid-term expansion observed that exceeds groundwater advection rate
41 Summary and Implications Klozur CR performed better then iron-edta activated Klozur persulfate NAPL presence was not a show stopper ZOE max for CR is best determined at later times (e.g., six month to year) and future studies should encompass larger area, more depth, and more discrete intervals
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